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Taxes - Deferred Tax Credits (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | kr 5,027 | kr 5,453
Unrecognized deferred tax credits tax value | 1,114 | kr 1,148
2025 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 32 |
Unrecognized deferred tax credits tax value | 108 |
2026 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 121 |
Unrecognized deferred tax credits tax value | 122 |
2027 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 33 |
Unrecognized deferred tax credits tax value | 105 |
2028 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 1,376 |
Unrecognized deferred tax credits tax value | 9 |
2029 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 2,132 |
Unrecognized deferred tax credits tax value | 10 |
2030 or later [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | kr 1,333 |

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